Infrared Spectroscopy of V838 Monocerotis in 2015 and 2022

Geballe, T. R., Kaminskiy, B. M., Banerjee, D. P. K., Evans, A., Pavlenko, Y., Rushton, Mark, Popescu, M. and Eyres, Stewart Paul shore (2025) Infrared Spectroscopy of V838 Monocerotis in 2015 and 2022. Monthly Notices of the Royal Astronomical Society . ISSN 0035-8711

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Official URL: https://doi.org/10.1093/mnras/staf1193

Abstract

We report medium-resolution m spectroscopy obtained in 2015 and 2022 and high resolution m and m spectroscopy obtained in 2015 of V838 Monocerotis, along with modeling of the spectrum. V838 Mon underwent a series of eruptions and extreme brightenings in 2002, which are thought to have occured as a result of a stellar merger. The new spectra and modelling of them reveal a disturbed red giant photosphere that is probably continuing to contract and ejecta that are cooling and continuing to disperse at velocities up to 200kms.


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